bigprod - # PRODUCTION SETS AND PARAMETERS # s set prod...

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### PRODUCTION SETS AND PARAMETERS ### # set prod 'products'; # Members of the product group s param pt 'production time' {prod} > 0; # Crew-hours to produce 1000 units param pc 'production cost' {prod} > 0; # Nominal production cost per 1000, used # to compute inventory and shortage costs ### TIME PERIOD SETS AND PARAMETERS ### # param first > 0 integer; # Index of first production period to be modeled param last > first integer; # Index of last production period to be modeled set time 'planning horizon' := first. .last; s ### EMPLOYMENT PARAMETERS ### # param cs 'crew size' > 0 integer; # Workers per crew param sl 'shift length' > 0; # Regular-time hours per shift param rtr 'regular time rate' > 0; # Wage per hour for regular-time labor param otr 'overtime rate' > rtr; # Wage per hour for overtime labor param iw 'initial workforce' >= 0 integer; # Crews employed at start of first period param dpp 'days per period' {time} > 0; # Regular working days in a production period param ol 'overtime limit' {time} >= 0; # Maximum crew-hours of overtime in a period param cmin 'crew minimum' {time} >= 0; # Lower limit on average employment in a period param cmax 'crew maximum' {t in time} >= cmin[t]; # Upper limit on average employment in a period param hc 'hiring cost' {time} >= 0; # Penalty cost of hiring a crew param lc 'layoff cost' {time} >= 0; # Penalty cost of laying off a crew ### DEMAND PARAMETERS ### # param dem 'demand' {prod,first. .last+1} >= 0; # Requirements (in 1000s) # to be met from current production and inventory param pro 'promoted' {prod,first. .last+1} logical; # true if product will be the subject # of a special promotion in the period ### INVENTORY AND SHORTAGE PARAMETERS ### # param rir 'regular inventory ratio' >= 0; # Proportion of non-promoted demand # that must be in inventory the previous period
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bigprod - # PRODUCTION SETS AND PARAMETERS # s set prod...

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